Automatic lifting device for acoustic transmission transducer in pile foundation

Abstract

This utility model relates to the field of pile foundation testing, and in particular to an automatic lifting device for transducers using the acoustic wave transmission method for pile foundations. It includes at least two sets of clamping wheel groups, each set comprising a drive wheel and a pressure wheel. The pressure wheel and drive wheel are close together, radially clamping the transducer cable placed between their circumferential surfaces. A drive motor drives the drive wheels of the at least two sets of clamping wheel groups to rotate synchronously and uniformly, causing friction to move at least two transducer cables synchronously and uniformly. When using this device to perform integrity testing on pile foundations, after the pressure wheel and drive wheel of each clamping wheel group radially clamp the transducer cable placed between their circumferential surfaces, the drive motor drives the drive wheels of the at least two sets of clamping wheel groups to rotate synchronously and uniformly. The friction of the drive wheels moves the transducer cable, causing at least two transducers to automatically and synchronously rise or fall at a uniform speed, avoiding the influence of human factors on the accuracy of the test results.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation testing, and in particular to an automatic lifting device for a pile foundation acoustic transmission transducer. Background Technology

[0002] Acoustic wave transmission is a common method for inspecting the integrity of cast-in-place concrete pile foundations. Typically, it requires inspectors to simultaneously insert multiple transducers, some of which are transmitting transducers, and others are receiving transducers. The inspectors need to position the transmitting and receiving transducers at the same horizontal level, and then pull the cables of both transducers at a constant speed, causing them to rise synchronously and uniformly from the bottom to the top of the pile or descend synchronously and uniformly from the top to the bottom. The ultrasonic pulses emitted by the transmitting transducer penetrate the pile concrete and are received by the receiving transducer. The receiving transducer, or its connected processing device, uses parameters such as the propagation time, wave velocity, and waveform of the ultrasonic waves in the concrete medium to assess whether there are defects such as cracks or voids in the pile. Existing technologies rely on manually pulling the transducer cables to raise and lower the transducers, which has certain limitations: on the one hand, it is difficult to ensure that multiple transducers remain on the same horizontal plane when manually pulling them, which can cause abnormal ultrasonic signals received by the receiving transducer and affect the accuracy of the detection results; on the other hand, it is difficult to ensure uniform speed when manually pulling the transducers, which can cause the receiving transducer to fail to receive and identify signals in some sections, thus affecting the accuracy of the detection results. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an automatic lifting device for transducers in the pile foundation acoustic transmission method, which automatically and synchronously lifts or lowers multiple transducers at a uniform speed, avoiding the influence of human factors on the accuracy of the test results.

[0004] To solve the above problems, the present invention provides an automatic lifting device for pile foundation acoustic wave transmission transducers, including at least two sets of clamping wheel sets. Each set of clamping wheel sets includes a drive wheel and a pressure wheel. The pressure wheel and the drive wheel are close to each other and radially clamp the transducer cable placed between their circumferential surfaces. A drive motor is provided to drive the drive wheels of at least two sets of clamping wheel sets to rotate synchronously and uniformly, thereby causing at least two transducer cables to move synchronously and uniformly.

[0005] Furthermore, the center of the drive wheel's circumferential surface is recessed inward to form a circumferential groove for placing the transducer cable. The width of the pressure wheel is the same as the width of the circumferential groove. The pressure wheel and the drive wheel approach each other and radially clamp the transducer cable placed on the circumferential groove.

[0006] Furthermore, it includes at least three vertical conductor shafts located in front of the drive wheel, with a conductor gap formed between two adjacent vertical conductor shafts that aligns with the drive wheel circumferential groove for the transducer cable to pass through and guide the transducer cable to the drive wheel circumferential groove.

[0007] Furthermore, a soft cleaning brush is installed around the vertical axis of the conductor to clean the transducer cable that moves synchronously and at a uniform speed.

[0008] Furthermore, including the drive rod, at least two sets of clamping wheel sets have their drive wheels mounted and fixed on the drive rod; the drive motor drives the drive rod to rotate, causing the drive wheels of at least two sets of clamping wheel sets to rotate synchronously and uniformly.

[0009] Furthermore, it includes a tripod with a clamping wheel assembly mounted on top of the tripod.

[0010] Furthermore, the tripod is equipped with an installation platform on top, and the clamping wheel assembly is mounted on the installation platform.

[0011] Furthermore, it includes a cable puller comprising an upper housing and a lower housing hinged together, with the pressure wheel of the clamping wheel assembly installed in the upper housing and the drive wheel of the clamping wheel assembly installed in the lower housing. The pressure wheel and the drive wheel are brought close to each other and radially clamp the transducer cable placed between their circumferential surfaces on the rotating cover of the upper housing relative to the lower housing.

[0012] Beneficial effects: The automatic lifting device for transducers in the pile foundation acoustic transmission method includes at least two sets of clamping wheel groups. Each set of clamping wheel groups includes a drive wheel and a pressure wheel. After the pressure wheel and drive wheel of each set of clamping wheel groups approach each other and radially clamp the transducer cable placed between their circumferential surfaces, the drive motor drives the drive wheels of at least two sets of clamping wheel groups to rotate synchronously and uniformly. The friction of the drive wheels drives the transducer cable to move, so that at least two transducers are automatically and synchronously raised or lowered at a uniform speed, avoiding the influence of human factors on the accuracy of the test results. Attached Figure Description

[0013] Figure 1 This is a simplified structural diagram of an automatic lifting device for a transducer using the acoustic wave transmission method for pile foundations, with the vertical axis of the conductor hidden.

[0014] Figure 2 This is a simplified structural diagram of an automatic lifting device for pile foundation testing using the acoustic wave transmission method transducer.

[0015] Symbol explanation:

[0016] 1-Tripod; 2-Wire puller; 3-Pile foundation; 4-Sonic logging tube; 6-Transducer; 7-Ground; 8-Conductor vertical shaft; 11-Mounting platform; 21-Upper housing; 22-Lower housing; 23-Drive rod; 24-Drive wheel; 25-Pressing wheel; 26-Mounting rod; 27-Boss; 28-Drive motor; 29-Hinge; 61-Transducer cable; 81-Conductor gap; 82-Cleaning soft brush; 241-Circumferential cable groove; 281-Output shaft. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] Automatic lifting device for transducer in pile foundation acoustic transmission method, such as Figure 1 As shown, a cable puller 2 is mounted on the mounting platform 11 at the top of the tripod 1. The cable puller 2 includes an upper housing 21 and a lower housing 22. The right side walls of the upper and lower housings 21 and 22 are hinged together via hinge 29. A drive rod 23 is rotatably mounted between the left and right side walls of the lower housing 22. Four drive wheels 24 are fixedly mounted on the drive rod 23. The center of the circumferential surface of each of the four drive wheels 24 is recessed inward to form a circumferential groove 241. A mounting rod 26 is fixedly mounted between the left and right side walls of the upper housing 21. Four pressure rollers 25 are rotatably mounted on the mounting rod 26 via bearings (not shown in the figure). The four pressure rollers 25 face downward and are aligned with the four drive wheels 24. The width of the pressure rollers 25 is the same as the width of the circumferential groove 241 of the drive wheels 24.

[0019] See Figure 2 After placing the tripod 1 on the ground 7 around the pile foundation 3, the operator adjusts the tripod 1 until the mounting platform 11 on top is horizontal. The cable puller 2 is then installed on the mounting platform 11, and the upper housing 21 of the cable puller 2 is rotated upwards to open. Two sonic logging tubes 4 are pre-embedded in the pile foundation 3. A transducer 6 is placed at the bottom of each of the two sonic logging tubes 4, one being a transmitting transducer 6 and the other a receiving transducer 6, ensuring both transducers 6 are at the same horizontal position. The lower housing 22 of the cable puller 2 has five vertical conductor shafts 8 in front of the drive wheel 24. A conductor gap 81 is formed between adjacent vertical conductor shafts 8, aligning with the circumferential groove 241 of the drive wheel 24. The width of the conductor gap 81 is the same as the circumferential groove 241 of the drive wheel 24. The operator tilts the cable 61 connected to the transducer 6 upwards until it passes through the wire gap 81 and is placed on the circumferential groove 241 of the drive wheel 24. Then, the upper housing 21 of the cable puller 2 is rotated relative to the lower housing 22 and covered. The pressure wheel 25 then approaches the drive wheel 24, and the two together form a clamping wheel group, which radially clamps the transducer cable 61 placed between the circumferential surfaces of the two.

[0020] A boss 27 extends to the right from the bottom of the lower housing 22. A drive motor 28 is mounted on the top of the boss 27, and its output shaft 281 is fixedly connected to the right end of the drive rod 23 through a through hole (not shown in the attached figure) on the right side wall of the lower housing 22. Driven by the output shaft 281 of the drive motor 28, the drive rod 23 rotates forward at a constant speed, driving the four drive wheels 24 to rotate forward synchronously at a constant speed. This causes the two transducer cables 61 clamped between the drive wheels 24 and the pressure wheel 25 to tilt upward synchronously at a constant speed, raising the transducer 6 located at the bottom of the sonic logging tube 4 to the top of the sonic logging tube 4 synchronously at a constant speed. During the lifting process, the ultrasonic pulses emitted by the transmitting transducer 6 pass through the concrete of the pile foundation 3 and are received by the receiving transducer 6. The processing device (not shown in the attached figure) connected to the receiving transducer 6 uses parameters such as the propagation time, wave velocity, and waveform of the ultrasonic waves in the concrete medium to evaluate whether there are defects such as cracks and voids in the pile foundation. Two transducers 6 are raised synchronously and at a uniform speed. This avoids abnormal ultrasonic signals received by the receiving transducer 6 and ensures that the receiving transducer 6 can receive the ultrasonic waves emitted by the transmitting transducer 6 in a timely manner throughout the entire raising process. A soft cleaning brush 82 is circumferentially mounted on the vertical shaft 8 of the conductor. This brush cleans the transducer cable 61 as the drive wheel 24 moves backward due to friction, preventing dust from the cable 61 from entering the circumferential groove 241 of the drive wheel 24 and affecting the frictional driving effect of the drive wheel 24 on the cable 61.

[0021] In this embodiment, two transducers 6 are placed at the bottom of the acoustic logging tube 4. The drive wheel 24 is driven by the drive motor 28 to rotate in the forward direction, causing the two transducers 6 to be synchronously and uniformly lifted from the bottom of the acoustic logging tube 4 to the top of the acoustic logging tube 4. Alternatively, the two transducers 6 can be placed at the top of the acoustic logging tube 4 instead of inside the tube, allowing the drive motor 28 to drive the drive wheel 24 to rotate in the reverse direction, causing the two transducers 6 to synchronously and uniformly descend from the top of the acoustic logging tube 4 to the bottom of the tube.

[0022] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A pile foundation acoustic wave transmission method transducer automatic lifting device, characterized in that: It includes at least two sets of clamping wheel sets, each set of clamping wheel sets including a drive wheel (24) and a pressing wheel (25), the pressing wheel (25) and the drive wheel (24) are close to each other and radially clamp the transducer cable (61) placed between their circumferential surfaces; a drive motor (28) is provided to drive the drive wheel (24) of at least two sets of clamping wheel sets to rotate synchronously and uniformly, and friction drives at least two transducer cables (61) to move synchronously and uniformly.

2. A pile foundation acoustic wave transmission method transducer automatic lifting device according to claim 1, characterized in that: The center of the circumferential surface of the drive wheel (24) is recessed to form a circumferential groove (241) for placing the transducer cable (61). The width of the pressure wheel (25) is the same as the width of the circumferential groove (241). The pressure wheel (25) and the drive wheel (24) approach each other and radially clamp the transducer cable (61) placed on the circumferential groove (241).

3. A pile foundation acoustic wave transmission method transducer automatic lifting device according to claim 2, characterized in that: Includes a conductor vertical shaft (8) located in front of the drive wheel (24), there are at least 3 conductor vertical shafts (8), and a conductor gap (81) is formed between two adjacent conductor vertical shafts (8) to align with the drive wheel circumferential groove (241) for the transducer cable (61) to pass through and guide the transducer cable (61) to the drive wheel circumferential groove (241).

4. A pile sonic wave transmission method transducer automatic lifting device according to claim 3, characterized in that: A cleaning soft brush (82) is provided around the vertical axis (8) of the conductor to clean the transducer cable (61) which moves synchronously and at a uniform speed.

5. The pile sonic wave transmission method transducer automatic lifting device according to claim 1, characterized in that: The drive rod (23) includes a drive rod (23), and at least two sets of clamping wheel sets with drive wheels (24) are mounted and fixed on the drive rod (23); the drive motor (28) drives the drive rod (23) to rotate, causing the drive wheels (24) of at least two sets of clamping wheel sets to rotate synchronously and at a uniform speed.

6. A pile sonic wave transmission method transducer automatic lifting device according to claim 1, characterized in that: Includes a tripod (1), with a clamping wheel assembly mounted on top of the tripod (1).

7. A pile sonic wave transmission method transducer automatic lifting device according to claim 6, characterized in that: The tripod (1) has an installation platform on top, and the clamping wheel assembly is installed on the installation platform (11).

8. A pile sonic wave transmission method transducer automatic lifting device according to claim 1, characterized in that: The device includes a cable puller (2), which comprises an upper housing (21) and a lower housing (22) hinged together. The pressure wheel (25) of the clamping wheel assembly is installed inside the upper housing (21), and the drive wheel (24) of the clamping wheel assembly is installed inside the lower housing (22). When the upper housing (21) rotates relative to the lower housing (22), the pressure wheel (25) and the drive wheel (24) move closer to each other and radially clamp the transducer cable (61) placed between the circumferential surfaces of the two.

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